Quote:
Originally Posted by ksa8907
I dont have any experience with forced induction, but your engine will never go lean unless there are component failures. Your o2 sensors will keep the fuel mixture in the correct range. Those horror stories are from people building and tuning engines.
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The O2 sensor feedback is only enabled when the engine is running in closed loop. It's in closed loop when cruising, idling, or with relatively small changes to the gas pedal. Even so, the fuel delivery can only be "trimmed" within a certain range. Hard acceleration with flip the ECU into open loop where the O2 sensors are not part of the fueling process - instead a set of fixed tables are used.
So, yes, the engine can go lean (or rich) if one messes with the assumptions used by the manufacturer to set up the ECU programming.